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3 years ago

14

Find all possible solutions for the following equation x²+7x+63=63

2 answers:

Ugo [173]3 years ago

8 0

Answer:

Step-by-step explanation:

X^2+7x+63=63

<=> x^2+7x=63-63=0

<=> X(x+7)=0

<=> x1=0

X2=-7

iVinArrow [24]3 years ago

4 0

Answer:

0 or -7

Step-by-step explanation:

x² + 7x + 63 = 63

⇔ x² + 7x + 63 - 63 = 0

⇔ x² + 7x = 0

⇔ x(x + 7) = 0

So either: x = 0

or x + 7 = 0 ⇔ x = -7

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castortr0y [4]

Answer:

x = 1

Step-by-step explanation:

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If m<7=100, find m<6

PIT_PIT [208]

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2 years ago

X, Y and Z form the vertices of a triangle. XY = 12.4m, XZ = 10.4m and YZ = 8.7m. Find the angle ∠ YXZ rounded to 1 DP.

sweet-ann [11.9K]

Answer:

43.8°

Step-by-step explanation:

Applying,

Cosine rule,

From the diagram attached,

x² = y²+z²-2yxcos∅.................... Equation 1

where ∅ = ∠YXZ

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Substitute these values into equation 1

8.7² = 10.4²+12.4²-[2×10.4×12.4cos∅]

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75.69 = 261.92-257.92cos∅

collect like terms

257.92cos∅ = 261.92-75.69

257.92cos∅ = 186.23

Divide both sides by the coefficient of cos∅

cos∅ = 186.23/257.92

cos∅ = 0.722

Find the cos⁻¹ of both side.

∅ = cos⁻¹(0.7220)

∅ = 43.78°

∅ = 43.8°

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Answer:

Step-by-step explanation:

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