Question 448578
Factor:
1. 3r^7 - 192r^4
= 3r^4[r^3-64]
= 3r^4(r-4)(r^2+4r+16)
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Factor by grouping:
2. 3x^3- 27x^2 - 4x + 36
3x^2(x-9) -4(x-9)
=(x-9)(3x^2-4)
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Factor:
3. a^3 – 49a^2 – 9a + 441
= a^2(a-49)-9(a-49)
= (a-49)(a-3)(a+3)
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Multiply:
4. (x^4 +x^3)(x^4+ x^3- x^2)
Multiply each term of the 1st factor times
each term of the 2nd factor.
The add the like terms.
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Add:
5. (9 + 5x +6x^2 + 8x^3) + (4 – 5x +6x^2 – 8x^3)
Add the like terms:
= 13 + 0 +12x^2 + 0
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= 12x^2+13
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Cheers,
Stan H.