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Rewrite the function by completing the square.

{:[g(x)=4x^(2)-16 x+7],[g(x)=◻(x+◻)^(2)+◻]:}

Rewrite the function by completing the square.\newlineg(x)=4x216x+7g(x)=(x+)2+ \begin{array}{l} g(x)=4 x^{2}-16 x+7 \\ g(x)=\square(x+\square)^{2}+\square \end{array}

Full solution

Q. Rewrite the function by completing the square.\newlineg(x)=4x216x+7g(x)=(x+)2+ \begin{array}{l} g(x)=4 x^{2}-16 x+7 \\ g(x)=\square(x+\square)^{2}+\square \end{array}
  1. Identify coefficients: Identify the quadratic coefficient, linear coefficient, and constant term in the given quadratic function.\newlineg(x) = 4x216x+74x^2 - 16x + 7\newlineQuadratic coefficient (a) = 44\newlineLinear coefficient (b) = 16-16\newlineConstant term (c) = 77
  2. Factor out quadratic coefficient: Factor out the quadratic coefficient from the x2x^2 and xx terms.\newlineg(x)=4(x24x)+7g(x) = 4(x^2 - 4x) + 7
  3. Find value to complete the square: Find the value to complete the square. This is done by taking half of the coefficient of xx (after factoring out the quadratic coefficient) and squaring it.\newlineHalf of the coefficient of xx is 42=2-\frac{4}{2} = -2.\newlineSquaring this value gives (2)2=4(-2)^2 = 4.
  4. Add and subtract to complete the square: Add and subtract the value found in the previous step inside the parentheses to complete the square. Remember to balance the equation by adding the same value outside the parentheses, multiplied by the quadratic coefficient.\newlineg(x) = 44(x^22 - 44x + 44 - 44) + 77\newlineTo balance the equation, we add 4×4=164 \times 4 = 16 to the constant term.\newlineg(x) = 44(x^22 - 44x + 44) - 1616 + 77
  5. Combine constant terms: Combine the constant terms outside the parentheses.\newlineg(x) = 44(x^22 - 44x + 44) - 99
  6. Write as perfect square: Write the trinomial as a perfect square. g(x)=4(x2)29g(x) = 4(x - 2)^2 - 9