contestada

Evaluate
1. Given that a= -2, b = 1 and c= 2
then Find
a). a²+b²+c²
b). 5/3 a²b + ¾ abc + 5
2. If x = -1, y=2 and z=-2 , evaluate
3x²y +5xy²+2xyz

Respuesta :

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Answer:

1. Ans;

a). a²+b²+c² —> (-2)²+ (1)²+(2)²=4+1+4= 9

b).

[tex] \frac{5}{3} {a}^{2} b + \frac{3}{4} abc + 5 \\ \\ \frac{5}{3} ( { - 2)}^{2} (1) + \frac{3}{4} ( - 2)(1)(2) \\ \\ \frac{5}{3} (4) + \frac{3}{4} ( - 4) \\ \\ = \frac{20}{3} - 3 \\ \frac{20 - 9}{3} = \frac{11}{3} = 3.666[/tex]

2. Ans;

3x²y+5xy²+2xyz = 3(-1)²(2) + 5(-1)(2)² + 2(-1)(2)(-2) = 3(1)(2) + 5(-1)(4) + 2(4) = 6 – 20 + 8 = – 6

I hope I helped you^_^

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