Question

Simplify (xy + yz) 2 - 2x2yz. Find the value when x=-1, y = 1 and 2 = 2.7
​

Answer 1

Answer:

(xy+yz)

2

−2x

2

y

2

z when x=−1,y=1,z=2

⇒[y(x+z)]

2

−2x

2

y

2

z

⇒y

2

[x

2

+z

2

+2xz−2x

2

z]

⇒(1)

2

[(−1)

2

+2

2

+2(−1)(2)−2(−1)

2

(2)]

⇒[1+4−4−4]⇒−3

∴(xy+yz)

2

−2x

2

y

2

z at x=−1,y=1 and z=2 is −3

Step-by-step explanation:

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Answer 2

Answer:

$\left(-1\times \:1+1\times \:2.7\right)\times \:2-2\left(-1\right)\times \:2\times \:1\times \:2.7=14.2$

Step-by-step explanation:

$\left(-1\times \:1+1\times \:2.7\right)\times \:2-2\left(-1\right)\times \:2\times \:1\times \:2.7$

$\mathrm{Apply\:rule\:-\left(-a\right)=a}$

$=\left(-1\times \:1+1\times \:2.7\right)\times \:2+2\times \:1\times \:2\times \:1\times \:2.7$

$=3.4+10.8$

$\mathrm{Add\:the\:numbers:}\:3.4+10.8=14.2$

$=14.2$