Answer:
408,506
Step-by-step explanation:
D = - 9
D - 7 = -18
D - 7 + 7 = -18 + 7
D = -9
C. since 8, 15, 17 are pythagorean triples
1) 3x(3x-1)
2)5(9x^2-3x+1)
18
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