15x2 + 58x + 48
= 15x2 + 18x + 40x + 48
= 3x(5x + 6) + 8(5x + 6)
= (3x + 8)(5x + 6)
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All you need to do is add the numbers together like you would for two plus two. To check your work, a calculator will be a great option,but before you use one:for more of a challenge USE YOUR BRAIN! The answer is 288.
48 plus 510 is 558
48
96+72+48+24=240
36 + 14 + 48 = 98