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3 years ago

Write an algebraic expression for each situation. a. 7 more than a number b. Twice a number

Mathematics

1 answer:

Alex17521 [72]3 years ago

5 0

Step-by-step explanation:

a- 7 + X

b- 2x is the equation for these terms I think so

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Raul simplified the expression, as shown below.

Softa [21]

Answer:

Raul's errors are in the application of the distributive property(he applied it wrongly), in not respecting the precedence of operations, and in the multiplication of two terms with the same base(we add the exponent).

Step-by-step explanation:

Distributive property:

The distributive property of multiplication is:

a*(b + c) = a*b + a*c

Precedence of operations:

First multiplication, then addition.

Multiplication of terms with the same base:

The multiplication of h*h = h², which Raul missed.

The correct simplification is given by:

$-[3h + 7h(2-h)] = -[3h + 14h - 7h^2] = -[17h - 7h^2]=7h^2 - 17h$

4 0

3 years ago

Read 2 more answers

Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.

Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$2x^{2} -8x-90$

equate to zero

$2x^{2} -8x-90=0$

$2=-1\\b=-8\\c=-90$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(2)(-90)}} {2(2)}$

$x=\frac{8\pm\sqrt{784}} {4}$

$x=\frac{8\pm28} {4}$

$x=\frac{8+28} {4}=9$

$x=\frac{8-28} {4}=-5$

therefore

The solutions are x=-5, x=9

6 0

3 years ago

Which of the following is a term, variable, and expression? WHICH ONE IS ALL OF THE ABOVE NOT WHICH IS A TERM WHICH IS A VARIABL

babunello [35]

Answer:

h is a variable, 21 is a term and 5 x^2 is an expression.

Step-by-step explanation:

h is a variable, 21 is a term and 5 x^2 is an expression.

8 0

2 years ago

Read 2 more answers

What two numbers add and get -18 and multiply and get 72?

omeli [17]

The numbers are -12 and -6:

-12 + -6 = -18
-12 * -6 = 72

5 0

3 years ago

Read 2 more answers

1+2<br>Please help<br>filler filler filler

Nadya [2.5K]

Answer:

1+2=3 is answer

Step-by-step explanation:

so what help u need?

6 0

3 years ago