Question

simplify 3a(5a-&7)+3 and find the value for:-
1} a=2
2} a=-1


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Answer 1

Answer:

1)3×2(5×2-7)+3

6×3+3

21

2)3×(-1){5×(-1)-7)+3

-3×(-12)+3

36+3

39

Answer 2

Answer:

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Step-by-step explanation:

15a^2-21a+3 putting a=2 ,15×4-21×2+3=60-42+3=63-42=21, putting a=-1,15+21+3=15+24=39