what is the product of (x+4)and (x-5)

Question

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Answer 1

4x(x - 5) - 5x(x - 4) = -1
4x*x - 4x*5 - 5x*x - 5x*-4 = -1
4x^2 - 20x - 5x^2 + 20x = -1
-x^2 = -1
x^2 = 1
x = 1, x = -1

So the answer is x = 1 or x = -1.

I hope that helps! :)

Answer 2

perimeter of a triangle with side (5x – 3)cm, (2x + 4)cm and (-4x + 6) cm. *