alleryGrouping ax + ay + bx + by gives the factorisation
A(a + b)(x + y)
B(a - b)(x + y)
C(a + b)(x - y)
D(a + x)(b + y)
Answer & Solution
Correct answer: A. (a + b)(x + y)
Group as a(x + y) + b(x + y), then take out the common factor (x + y).
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