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Nataly_w [17]
2 years ago
6

Simplify the expression

Mathematics
1 answer:
Nastasia [14]2 years ago
8 0

<u>Solution:</u>

Substitute the value of the variable into the expression, then simplify.

             Answer: -8

_________________________________________________________

Hope this helps! If so, lmk! Thanks and good luck!

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What is the voulme of a cube with the side length of 5
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raj and his sister zia are both at secondary school. Raj is three years older than zia. the sum of the squares of their ages is
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Let Zia's age be = x years

Raj is three years older than Zia, so Raj's age = x+3 years

As the sum of the squares of their ages is 369, so

x^{2}+(x+3)^{2}=369

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2x^{2}+6x+9=369

2x^{2}+6x-360=0

Factoring 2 out we have,

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Now solving this equation,

x^{2}+15x-12x-180=0

x(x+15)-12(x+15)

(x+15)(x-12)

x=-15 and x=12

Neglect the negative value as x cannot be negative

So x=12

Hence, Zia's age is 12 years and

Raj's age is 12+3 = 15 years


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