9. If a = -2, b= -3 and c=2 then find the value of each of the following. (1) a2 + b2 +c2 (i) 4abc (iii) ab + bc + ca (iv) 3ab-4bc +5ca (v) ab +9
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Step-by-step explanation:
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Answered by
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Answer:
Step-by-step explanation:
i) a² + b² + c² = (-2)² + (-3)² + 2²
= 4 + 9 + 4
= 17
ii) 4abc = 4*(-2)*(-3)*2
= 48
iii) ab + bc + ca = (-2)*(-3) + (-3)*2 + 2*(-2)
= 6 - 6 - 4
= 0 -4 = -4
iv) 3ab - 4bc + 5ca = 3*(-2)*(-3) -4*(-3)*2 + 5*2*(-2)
= 18 + 12 - 20
= 30 - 20
= 10
v) ab + 9 = (-2)*(-3) + 9 = 6 + 9 = 15
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