exam
Maths Puzzle
Numerical Ability
Rewrite the middle term as the sum of two terms and then factor by grouping
x^2+4x-21
Thank you
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- x^2+4x-21
x^2+7x-3x-21
x(x+7)-3(x+7)
(x-3)(x+7)
x=3 or x=-7 - 10 years agoHelpfull: Yes(0) No(0)
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