7. What number must be added to x² - 4x + to x² - 4x + - to make the polynomial a perfect square trinonial ?
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7. What number must be added to x² - 4x + to x² - 4x + - to make the polynomial a
7. What number must be added to x² - 4x + to x² - 4x + - to make the polynomial a perfect square trinonial ?
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Answer:
4
Step-by-step explanation:
In completing the square, c is given by
Given,
a = 1, b = -4, c = ?
Since b = -4, substitute
---> Simplify
=
Therefore, 4 must be added to for it to be perfect square trinomial.