Answer
(4x+1)(2x+7)
Work Step by Step
You are given $8x^{2}$+30x+7. Factor it out:
$8x^{2}$+28x+2x+7 -break out the middle value-
($8x^{2}$+28x)+(2x+7) -group the first two and last two terms-
4x(2x+7)+1(2x+7) -Find the GCF of each grouping's-
(4x+1)(2x+7) -factor out the common term-
=(2x+7)(4x+1)