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Chewbacka2020
29.05.2021 •
Mathematics
Work out the coordinates of the points of intersection of the graphs
y= 4x^2+8x+3 and y=x+5
Answer (,) and (,)
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Ответ:
Step-by-step explanation:
The point of intersection occurs when the two graphs have equal values of x and y at the same time. There is only one solution, because two straight lines can only intersect once.
Answer :
Ответ:
(- 2, 3 ) and (
,
)
Step-by-step explanation:
Given the 2 equations
y = 4x² + 8x + 3 → (1)
y = x + 5 → (2)
Substitute y = 4x² + 8x + 3 into (2)
4x² + 8x + 3 = x + 5 ( subtract x + 5 from both sides )
4x² + 7x - 2 = 0 ← in standard form
(x + 2)(4x - 1) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 2 = 0 ⇒ x = - 2
4x - 1 = 0 ⇒ 4x = 1 ⇒ x =![\frac{1}{4}](/tpl/images/1355/0069/0d86b.png)
Substitute these values into (2) for corresponding values of y
x = - 2 : y = - 2 + 5 = 3 ⇒ (- 2, 3 )
x =
: y =
+ 5 =
⇒ (
,
)
Ответ: