Multiply first and last coefficients:
2*(-9) = -18
Find 2 factors which multiply to -18 and add up to 17:
18 and -1
Rewrite quadratic with 17y split up as' 18y - y', Then factor by grouping:
2*(-9) = -18
Find 2 factors which multiply to -18 and add up to 17:
18 and -1
Rewrite quadratic with 17y split up as' 18y - y', Then factor by grouping: