Question

(8x²-15x)-(x²-27x)=ax²+bx

If the equation above is true for all values of x, what is the value of b-a ?

Answer 1

5

Explanation:

(8x² - 15x) - (x² - 27x) = ax² + bx

<=> 8x² - 15x - x² + 27x = ax² + bx

<=> 8x² - x² - 15x + 27x = ax² + bx

<=> 7x² + 12x = ax² + bx

a = 7, b = 12

b - a = 12 - 7 = 5

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