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Question

Write the degree of the polynomial (1) (x2+6)(x3-8) (2) y5+0y6-5y+8

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Solution

Consider the following polynomial. x2+6x3-8Multiply the above two binomials using distributive property. x2+6x3-8=x2x3-8 +6x3-8 =x2x3 +x2-8+6x3+6-8 =x5 +6x3-8x2-48Note that the highest power of x in the polynomial x5 +6x3-8x2-48 is 5So the degree of the polynomial x2+6x3-8 is 5Now consider the following polynomial y5+0y6-5y+8The coefficient of y6 is 0 in the above polynomial, so the second term becomes 0. y5+0y6-5y+8=y5-5y+8 Again, the highest power of x in the polynomial y5-5y+8 is 5So the degree of the polynomial y5+0y6-5y+8 is 5

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