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JAMB Mathematics 2020 Paper

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Question : 12

Total: 40

Simplify

\frac{324 - 4x^2}{2x + 18}

2(x - 9)
2(9 + x)
81 - x $^{2}$
-2(x - 9)

Solution:

234 - 4x $^{2}$ = 18 $^{2}$ - (2x) $^{2}$ = (18 - 2x)(18 + 2x)

2x + 18 = 2x + 18 = (2x + 18)

18 - 2x = 2(a - x) or -2(x - a)

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