Question

factorise 2 r square -9 r - 45

Answer 1

2r²-9r-45
=2r²+6r-15r-45
=2r(r+3)-15(r+3)
=(2r-15)(r+3)

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Answer 2

2r²-9r-45
2r²-15r+6r-45(by splitting the middle term)
r(2r-15)+3+(2r-15)
(r+3)(2r-15)