When the value of X is - 3, the value of the algebraic formula - 3x2 + ax-7 is - 25, then when x = - 1, the value of the algebraic formula is -______ ． | Math enthusiast | Mathematical art

When the value of X is - 3, the value of the algebraic formula - 3x2 + ax-7 is - 25, then when x = - 1, the value of the algebraic formula is -______ ．

When x = - 3, substituting - 3x2 + ax-7 = - 25, a = - 3, substituting a = - 3 and x = - 1 into - 3x2 + (- 3x) - 7, - 3 × (- 1) 2 + (- 3) × (- 1) - 7 = - 7

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