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Factor completely.

4x^(2)-28 x+40=

Factor completely.\newline4x228x+40=4x^{2}-28x+40=

Full solution

Q. Factor completely.\newline4x228x+40=4x^{2}-28x+40=
  1. Identify quadratic trinomial form: Identify the quadratic trinomial and its form.\newlineThe given expression is 4x228x+404x^2 - 28x + 40. This is a quadratic trinomial of the form ax2+bx+cax^2 + bx + c.
  2. Find two numbers for multiplication and addition: Find two numbers that multiply to acac (the product of the coefficient of x2x^2 and the constant term) and add up to bb (the coefficient of xx).\newlineFor the given expression, a=4a = 4, b=28b = -28, and c=40c = 40. We need to find two numbers that multiply to 4×40=1604 \times 40 = 160 and add up to 28-28.
  3. Find the two numbers: Find the two numbers.\newlineThe two numbers that multiply to 160160 and add up to 28-28 are 20-20 and 8-8.\newlineCheck: (20)×(8)=160(-20) \times (-8) = 160 and (20)+(8)=28(-20) + (-8) = -28.
  4. Rewrite middle term using two numbers: Rewrite the middle term using the two numbers found in Step 33.\newlineRewrite 28x-28x as 20x8x-20x - 8x.\newlineThe expression now looks like this: 4x220x8x+404x^2 - 20x - 8x + 40.
  5. Factor by grouping: Factor by grouping.\newlineGroup the terms into two pairs: (4x220x)(4x^2 - 20x) and (8x+40)(-8x + 40).\newlineFactor out the greatest common factor from each pair.\newlineFrom the first pair, factor out 4x4x: 4x(x5)4x(x - 5).\newlineFrom the second pair, factor out 8-8: 8(x5)-8(x - 5).\newlineThe expression now looks like this: 4x(x5)8(x5)4x(x - 5) - 8(x - 5).
  6. Factor out common binomial factor: Factor out the common binomial factor.\newlineThe common binomial factor is (x5)(x - 5).\newlineFactor this out to get: (x5)(4x8)(x - 5)(4x - 8).
  7. Simplify second factor: Simplify the second factor if possible.\newlineThe second factor 4x84x - 8 can be further factored by taking out the common factor of 44.\newlineThis gives us: 4(x2)4(x - 2).
  8. Write final factored form: Write the final factored form of the expression.\newlineThe final factored form of the expression is (x5)(4)(x2)(x - 5)(4)(x - 2).