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The graph of y = −5x^2 + 9 passes through (1,2a) in the
standard (x,y) coordinate plane. What is the value of a ?
F. 2
G. 4
H. 7
J. −1
K. −8

Sagot :

[tex]y=-5x^2+9\\\\(1;\ 2a)\to\ for\ x=1;\ y=2a\\\\for\ x=1\\\\y=-5\cdot1^2+9=-5+9=4\\\\2a=4\ \ \ \ /:2\\\\a=2\\\\Answer:F.[/tex]
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