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masya89 [10]
2 years ago
15

12a-3b2, when a=9,b=4

Mathematics
2 answers:
Archy [21]2 years ago
4 0

Answer:

12a - 3 {b}^{2}  = 12(9) - 3 {(4)}^{2} \\   = 108 - 48 \\  = 60

yarga [219]2 years ago
4 0

Answer:

60

Step-by-step explanation:

Just substitute the value

12\cdot (9) - 3 \cdot(4)^2 = \\108 - 48 =60

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Answer:

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Step-by-step explanation:

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\sqrt{(2b+3)^{2}}=\pm \sqrt{12}\\2b+3=\pm \sqrt{4\times 3}\\2b+3=\pm 2\sqrt{3}\\2b+3-3=\pm 2\sqrt{3}-3\\2b=-3\pm 2\sqrt{3}\\b=\frac{-3\pm 2\sqrt{3}}{2}\\b=\frac{-3+ 2\sqrt{3}}{2}\textrm{ or }b=\frac{-3- 2\sqrt{3}}{2}

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\frac{-3+ 2\sqrt{3}}{2}\textrm{ and }\frac{-3- 2\sqrt{3}}{2}

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