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Factorise the formula y = 4x² + 16x +15 in the form y = (2x +...)(2x + ...). help​

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Answer:

y = (2x + 5)(2x + 3)

Explanation:

y = 4x² + 16x + 15

consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 4 × 15 = 60 and sum = + 16

the factors are + 10 and + 6

use these factors to split the x- term

y = 4x² + 10x + 6x + 15 ( factor the first/second and third/fourth terms )

y = 2x(2x + 5) + 3(2x + 5) ← factor out (2x + 5) from each term

y = (2x + 5)(2x + 3)

since multiplication is commutative , then could be

y = (2x + 3)(2x + 5)

User Iamrajshah
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