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3 years ago

Evaluate the expression when a=6 and b= -5. -a+2b

Mathematics

2 answers:

Tomtit [17]3 years ago

6 0

It would be -(6)+2(-5). And then would be -6-10. That would give us -16. Hope that helped!!

Dafna11 [192]3 years ago

5 0

Answer:

-16

Step-by-step explanation:

a=6 b=-5

-a+2b

-6+2(-5)

-6-10

=-16

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3 years ago

(4,?) is on the line 8x - 3y = -10. Find the other half o the coordinate

Charra [1.4K]

(4, ?) is on 8x - 3y = -10

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3 years ago

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4 years ago

X² - 8x - 33=0<br> complete the square

Andreas93 [3]

<h2>Answer:</h2><h2></h2><h2> $\boxed{x_{1}=-3} \\ \\ \boxed{x_{2}=11}$ </h2>

<h2>Explanation:</h2>

Step 1. Write $x^2 - 8x - 33=0$ in the form $x^2+2ax+a^2=0$

$2a=-8\quad :\quad a=-4$

Step 2. Add and subtract $(-4)^2$ to the left side of the equation

$x^2-8x-33+\left(-4\right)^2-\left(-4\right)^2=0 \\ \\ \\ But: \\ \\ x^2+2ax+a^2=\left(x+a\right)^2 \\ \\ x^2-8x+\left(-4\right)^2=\left(x-4\right)^2$

Step 3. Complete square

$\left(x-4\right)^2-33-\left(-4\right)^2=0 \\ \\ \left(x-4\right)^2-49=0 \\ \\ (x-4)=\pm \sqrt{49} \\ \\ x-4=\pm 7 \\ \\ \boxed{x_{1}=-3} \\ \\ \boxed{x_{2}=11}$

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3 years ago