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If a-b=17.5 and a+b=10, what is the value of a2-b2?

What is the value of -3a2b when a=-4 and b=0.5?

math warm up 2

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Answers

1
What is the value of -3a²b when a=-4 and b=0.5?
-24
24
52
-12
2
If a-b=17.5 and a+b=10, what is the value of a²-b^2?
28
45
150
175
3
What is the sum of 5x²+10x-7 and 3x²-4x+2?
8x2+7x-2
8x2+6x-5
4
what is the value of (x-2)(x+3)-(x-4)(x+5)?
x2+12
14
15x+8
16
5
What is the arithmetic mean of 5x²+10x-7,3x²-4x+2 and 4x²+2
3x+8
4x2+12x-2
4x2+2x+1
4x2+2x-1