5x2 + 15 is the same as 10x+15
factor out a 5 since both the 10 and 15 are divisible by 5
now you have... 5(2x+3) and that's your answer
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5x2+14x-3 -15. 15*-15x2-x+15x-3[5xx x] [3*5x 3]x(5x-1)+3(5x-3)Answer: (5x-1)(x+3)
You can factor a five out of 15 plus 5x. Therefore, 15 plus 5x factors out to 5(3+x). Hope it helps :)
Factor 90 and find a combination that would add up to 21. 3x3x5x2. Try 3x3 plus 5x2. Nope. Try 3x5 plus 3x2. 15 + 6 = 21. Got it!
2x2+13x+15 = (2x+3)(x+5)
x2 + 8x + 15 = (x + 3) (x + 5).