Practice

Topic : Identities

Simplify (x+3)(x+5) by using the identity (x+a)(x+b) = x²+x(a +b)+ab

Step 1 : (x+3)(x+5) (Given Question here a = 3, b = 5)

Step 2 : (x +3) (x +5) = x² + x (3 +5) + 3 x 5 (Compare and Substitute in the given formula or identity)

Step 3 : x² + 8x + 15 ( ie., 3+5 =8 , 3 x 5 = 15)

Step 4 : Therefore x² + 8x + 15 is the answer.

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