All categories

3 years ago

How to solve question 8 d? Thanks so much. Whenever answers gets brainliest, also they used the discriminant formula.

Mathematics

1 answer:

rjkz [21]3 years ago

7 0

Answer

7.b

Step-by-step explanation:

You might be interested in

Od 2 ( 2 7 1-3 1 3 1-2 6:1-6 b = d = IDONE

Lena [83]

Answer:

$a = \boxed{1},\: b=\boxed{0}\\\\c=\boxed{0},\: d=\boxed{1}$

Step-by-step explanation:

$\begin{bmatrix} 2 & 7\\\\1 & 3\end{bmatrix}\:\begin{bmatrix} -3 & 7\\\\1 & -2\end{bmatrix}=\begin{bmatrix} a & b\\\\c & d\end{bmatrix}$

Multiply both the matrices on left side, we find:

$\begin{bmatrix} 2(-3)+7(1) & 2(7)+7(-2)\\\\1(-3)+3(1) & 1(7)+3(-2)\end{bmatrix}=\begin{bmatrix} a & b\\\\c & d\end{bmatrix}$

$\rightarrow\begin{bmatrix} -6+7 & 14-14\\\\-3+3 & 7-6\end{bmatrix}=\begin{bmatrix} a & b\\\\c & d\end{bmatrix}$

$\rightarrow\begin{bmatrix} 1 & 0\\\\0 & 1\end{bmatrix}=\begin{bmatrix} a & b\\\\c & d\end{bmatrix}$

Comparing the corresponding elements of both the matrices on both sides, we find:

$a = \boxed{1},\: b=\boxed{0},\:c=\boxed{0},\: d=\boxed{1}$

7 0

2 years ago

Write the missing exponent 256 = <img src="https://tex.z-dn.net/?f=%20%7B%3F%7D%5E%7B4%7D%20" id="TexFormula1" titl

antiseptic1488 [7]

Answer:

$4^4$

Step-by-step explanation:

$256\div4=64\div4=16\div4=4$

$4\times4\times4\times4=256$

$4^4=256$

Hope this helps.

3 0

2 years ago

HELP ASAP!!! please, I need help

nataly862011 [7]

Your answer would be be subtract 3

hope it helps

4 0

3 years ago

Read 2 more answers

Leah cut a 7 inch piece of ribbon into pieces that are each 1/2 an inch long.How many pieces of ribbon did she cut?

Sophie [7]

The answer is c) 14 hope this helps

3 0

3 years ago

Read 2 more answers

If you add Natalie's age and Fred's age, the result is 46. If you add Fred's age to 4 times Natalie's age, the result is 91.

Ivenika [448]

Answer:

Fred = 31

Natalie = 15

Step-by-step explanation:

We have Natalie and Fred's whos age are unknown, we know that when added, their ages equal 46. While when multiplied with Natalie's age 4 times, their ages is 91.

Create two systems :

F = Fred

N = Natalie

F + N = 46

4N + F = 91

We can change the first equation to Natalie's age alone :

N = 46 - F

Now substitute this into the second equation :

4(46 - F) + F = 91

Distribute :

184 - 4F + F = 91

Subtract 184 from both sides :

-4F + F = -93

Add like terms :

-3F = -93

Divide -3 from both sides :

F = 31

Therefore, Fred is 31 years old. Now replace his age in the first equation :

31 + N = 46

46 - 31

Therefore, Natalie is 15 years old.

8 0

3 years ago