Find the maximum or minimum of the following quadratic functions: （1）y=x²+10x-7 （2）y= -x²+3x+2 （3）y=（1/5）x²-2x+3 （4）y=（-2/3）x²+2x-6

Y = ax & sup2; + BX + C vertex in (- B / 2a, (4ac-b & sup2;) / 4A) (1) y = x & sup2; + 10x-7 vertex in (- 15, - 128 / 4) minimum = - 32 (2) y = - X & sup2; + 3x + 2 vertex in (3 / 2,17 / 4) maximum = 17 / 4 (3) y = (1 / 5) x & sup2; - 2x + 3 vertex in (5, - 2) minimum = - 2 (4) y

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