Maximum or minimum value of a quadratic equation / expression (i) When a > 0 ( in the equation
ax^2 + bx+c) the expression gives minimum value y = 4ac-b^2÷4a . When a<0 (in the equation
ax^2 + bx + c) the expression gives maximum value y = 4ac-b^2÷4a
If x is real find maximum value of 7+ 10x-5x^2
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why can't you answer it by yourself
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