Factorise (4a + 3) ² - (3a - 2)²

Correct Answer is : (a + 5)(7a + 1)

Correct Answer is : (a + 5)(7a + 1)

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JAMB Mathematics 2020 Paper

Question : 2

Total: 40

^2

^2

Solution:

[(4a + 3) $^2$ - (3a - 2) $^2$ = a $^2$ - b $^2$ = (a + b) (a - b)

= [(4a + 3) + (3a - 2)] [(4a + 3) - (3a - 2)]

= [4a + 3 + 3a - 2] [4a + 3 - 3a + 2]

= (7a + 1)(a + 5)

(a + 5) (7a + 1)

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