jika a=5, b=8,dan C=9, nilai dari 3a²+2b²-c² adalah
A. 422
B. 402
C. 524
D. 584
3a^2 = 3*5^2 = 225
2b^2 = 2*8^2 = 256
C^2 = 9^2 = 81
225+256-81 = 400 ( gaada jawaban tapi B paling deket)
Brainliest answernya kak <33
A. 422
B. 402
C. 524
D. 584
2b^2 = 2*8^2 = 256
C^2 = 9^2 = 81
225+256-81 = 400 ( gaada jawaban tapi B paling deket)
Brainliest answernya kak <33
= 3a² + 2b² - c²
= 3(5)² + 2(8)² - (9)²
= 3×25 + 2×64 - 81
= 75 + 128 - 81
= 122
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