Solving algebraic fractions to its lowest term follow the step-by-step explanation given below.
1. Simplify the algebraic fractions: \(\frac{x - 2}{8} - \frac{2(2x + 3)}{3} + \frac{11x - 3}{6}\)
Solution:
\(\frac{x - 2}{8} - \frac{2(2x + 3)}{3} + \frac{11x - 3}{6}\)
= \(\frac{3(x - 2) - 16(2x + 3) + 4(11x - 3)}{24}\)
= \(\frac{3x - 6 - 32x - 48 + 44x - 12}{24}\)
= \(\frac{15x - 66}{24}\)
= \(\frac{3(5x - 22)}{24}\)
= \(\frac{5x - 22}{8}\)
2. Reduce the algebraic fractions: \(\frac{2a}{a - 2} - \frac{a^{2}}{a^{2} - 4}\)
Solution:
\(\frac{2a}{a - 2} - \frac{a^{2}}{a^{2} - 4}\)
= \(\frac{2a}{a - 2} - \frac{a^{2}}{a^{2} - 2^{2}}\)
= \(\frac{2a}{a - 2} - \frac{a^{2}}{(a + 2) (a - 2)}\)
= \(\frac{2a(a + 2) - a^{2}}{(a + 2) (a - 2)}\)
= \(\frac{2a^{2} + 4a - a^{2}}{a^{2} - 4}\)
= \(\frac{a^{2} + 4a}{a^{2} - 4}\)
3. Reduce to lowest terms -- if possible: \(\frac{2}{a + b} - \frac{3}{a - b} + \frac{6a}{a^{2} - b^{2}}\)
Solution:
\(\frac{2}{a + b} - \frac{3}{a - b} + \frac{6a}{a^{2} - b^{2}}\)
= \(\frac{2(a - b) - 3(a + b) + 6a}{(a + b) (a - b)}\)
= \(\frac{2a - 2b - 3a - 3b + 6a}{a^{2} - b^{2}}\)
= \(\frac{5a - 5b}{a^{2} - b^{2}}\)
= \(\frac{5(a - b)}{(a + b)(a - b)}\)
= \(\frac{5}{(a + b)}\)
4. simplify and Reduce: \(\frac{3x}{x^{2} - 9} + \frac{1}{x^{2} + 2x - 15}\)
Solution:
\(\frac{3x}{x^{2} - 9} + \frac{1}{x^{2} + 2x - 15}\)
Step 1: Factorize the polynomials separately first:
(i) x\(^{2}\) – 9 = (x + 3) (x – 3)
(ii) x\(^{2}\) + 2x – 15 = x\(^{2}\) + 5x – 3x – 15
= x(x + 5) – 3(x + 5)
= (x + 5) (x – 3)
Step 2: Simplify by substituting with the factors:
\(\frac{3x}{x^{2} - 9} + \frac{1}{x^{2} + 2x - 15}\)
= \(\frac{3x}{(x + 3) (x - 3)} + \frac{1}{(x + 5) (x - 3)}\)
= \(\frac{3x(x + 5) + x + 3}{(x + 3)(x - 3)(x + 5)}\)
= \(\frac{3x^{2} + 15x + x + 3}{(x + 3)(x - 3)(x + 5)}\)
= \(\frac{3x^{2} + 16x + 3}{(x + 3)(x - 3)(x + 5)}\)
8th Grade Math Practice
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