Maths-
SAT
Easy
Question
5(x + a) + 3(x2−a) = 3x2 + 5x + 4
In the equation above, a is a constant. If the equation is true for all values of x, what is the value of a ?
The correct answer is: 2
5(x + a) + 3(x2−a) = 3x2 + 5x + 4
5x + 5a + 3x2 - 3a = 3x2 + 5x + 4
Comparing constants 2a = 4
a = 2
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