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3 years ago

Solve the equation using square roots. x2– 15 = 34

Mathematics

2 answers:

Olenka [21]3 years ago

7 0

Answer:

x=±7(A)

Step-by-step explanation:

x²-15=34

x²=34+15

x²=49

Taking square root on both sides

x=±7

WINSTONCH [101]3 years ago

5 0

Answer:

x=7 and X=-7

Explanation:

x^2-15=34

x^2=49

x=7 and X=-7

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Answer:

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Step by step explanation:

$x^2 +y^2 =8~~~~~~...(i)\\\\x-y=0~~~~~~~~~...(ii)\\\\\text{From (ii):}\\\\x-y = 0 \implies x = y\\\\\text{Substitute x = y in eq (i):}\\\\~~~~~~y^2 +y^2 =8\\\\\implies 2y^2 = 8\\ \\\implies y^2 = \dfrac 82\\\\\implies y^2 = 4\\\\\implies y = \pm\sqrt 4\\\\\implies y = \pm 2\\\\\text{Substitute y = x in equation (i):}\\ \\~~~~~~x^2 +x^2 = 8\\ \\\implies 2x^2 = 8\\\\\implies x^2 = \dfrac 82\\\\\implies x^2 = 4\\\\\implies x = \pm\sqrt 4\\\\\implies x = \pm2\\\\$

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