if y=-2 the value of 4y²+12y+1
Answers
Answered by
1
Step-by-step explanation:
3x+2y=12
Squaring both sides, we get
(3x+2y)
2
=144
⇒9x
2
+4y
2
+2×3x×2y=144
⇒9x
2
+4y
2
=144−12xy
⇒9x
2
+4y
2
=144−12×6 since xy=6
⇒9x
2
+4y
2
=144−72=72
∴9x
2
+4y
2
=72
Answered by
0
Answer:
-7
Step-by-step explanation:
y = -2
4(-2)²+12(-2)+1
4(4)-24+1
16-24+1. = -7
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