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tfracciscoramon
17.05.2021 •
Mathematics
in the right triangle shown below, the hypotenuse has a length of 10, one of the length of 5, what is the length of the other leg?
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Ответ:
(- 2, - 7) and (3, 13)
Step-by-step explanation:
Given the 2 equations
y = x² + 3x - 5 → (1)
y = 4x + 1 → (2)
Substitute y = 4x + 1 into (1)
x² + 3x - 5 = 4x + 1 ( subtract 4x + 1 from both sides )
x² - x - 6 = 0 ← in standard form
(x - 3)(x + 2) = 0 ← in factored form
Equate each factor to zero and solve for x
x - 3 = 0 ⇒ x = 3
x + 2 = 0 ⇒ x = - 2
Substitute these values into (2) for corresponding values of y
x = 3 : y = 4(3) + 1 = 12 + 1 = 13 ⇒ (3, 13)
x = - 2 : y = 4(- 2) + 1 = - 8 + 1 = - 7 ⇒ (- 2, - 7)
The graphs intersect at (- 2, - 7) and (3, 13)