Given that the value of the second power + 5x + C of the algebraic formula 2x when x = 1 is 10, find the value of the algebraic formula when x = - 2

Given that the value of the second power + 5x + C of the algebraic formula 2x when x = 1 is 10, find the value of the algebraic formula when x = - 2

When x = 1, 2x & # 178; + 5x + C = 10, through the known condition, we can find the value of C. that is, substituting x = 1 into the equation 2 + 5 + C = 10, we can know: C = 3. Substituting C = 3 back to the original equation, we can get: 2x & # 178; + 5x + C becomes: 2x & # 178; + 5x + 3 when x = - 2, the value of the algebraic formula 2x & # 178; + 5x + 3 is: 2 (- 2) &# 178