次の問題に適切な数字を入れて答えを完成させなさい。
(1) 2x(y + z) + 6ax2
= {y + z + }
= ( + y + z)
(2) a2(x + y) - a(x + y)2
= ( + ){ - (x + y)}
= ( + )( x y)
(3) x2 + 12x + 35
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= (x )(x )
(4) x2 - 10x + 21
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= (x )(x )
(5) x2 + 4x - 12
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= (x )(x )