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chyyy3
25.07.2019 •
Mathematics
Jan'ai was asked to determine the minimum for a function with zeros located at -1 and 5, which also has a y-intercept of (0,25). her work is shown. begin to write a function in factored form. f(x) = a(x+1)(x-5) substitute to determine a. -25 = a(0+1)(0-5) simplify and solve to find a. a=5 rewrite the function. f(x) = 5(x+1)(x-5) rewrite in standard form. f(x) = 5x^2-20x-25 find the x-coordinate of the vertex. x = -20/2(5) = -20/10; x = -2 find the y-coordinate of the vertex. y = 5x^2-20x-25 y = 5(-2)^2-20(-2)-25 y = 35 so (-2,35) which best describes the first error in jan'ai's work? a) she incorrectly determined the factors for the beginning function. b) she incorrectly determined the a value. c) she incorrectly transformed the equation to standard form. d) she incorrectly determined the x-coordinate of the vertex.
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Ответ:
Step-by-step explanation:
just got it right
Ответ:
D just took it
Ответ:
-12
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightStep-by-step explanation:
Step 1: Define
3 - 7x + 2x
x = 3
Step 2: Evaluate
Substitute in x: 3 - 7(3) + 2(3)Multiply: 3 - 21 + 6Subtract: -18 + 6Add: -12