Expand : (a + 2)(a - 1)
2 +98 + 18
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- Khushali.S.S.
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⚡ANSWER ⚡
a = -8 and a = -7
⚡EXPLANATION ⚡
(a+2) (a-1) 2 + 98 + 18
(a^2 - a + 2a - 2) + 116 = 0
2a^2 + 2a + 4 + 116 = 0
2a^2 + 2a + 112 = 0
2 ( a^2 + a + 56 ) = 0
a^2 + a + 56 = 0
Now, by factorisation method =>
a^2 + a + 56 = 0
a^2 + 8a - 7a + 56 = 0
a(a+8) +7(a+8) = 0
(a+8) (a+7) = 0
(a+8) = 0 => a = -8
(a+7) = 0 => a = -7
Hence , a = -8 and -7.
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