factorize: 1= 2x²-7x-15. 2= 84-2r-2r²
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1). = 2x² - 7x - 15
= 2x² - 10x + 3x - 15
= 2x(x - 5) + 3(x - 5)
= (2x + 3) (X - 5)
2). = 84 - 2r - 2r²
= 84 - 14r + 12r - 2r²
= 14(6 - r) + 2r(6 - r)
= (14 + 2r) (6 - r)
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