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Find the value of 2a² + 5b² when a= -6 and b= 2

Find the value of 2a² + 5b² when a= -6 and b= 2
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1 vote
Find the value of 2a² + 5b² when a= -6 and b= 2

User Tanveer Ahmad Dar
by
8.3k points

2 Answers

4 votes
2(-6^2)+5(2^2)
2(36)+5(4)
72+20
92
User Daniel Wood
by
7.7k points
3 votes
Plug in the values -6 into 'a' and 2 into 'b'.

2a² + 5b²
2(-6)² + 5(2)²
First solve the exponents ⇒ -6² means -6 * -6, which equals 36
2² = 2*2 = 4

2(36) + 5(4)
2*36 → 72
5*4 = 20
72 + 20 = 92

Final answer → 92

User ShennyL
by
8.1k points
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