Q. Use Pascal's Triangle to expand (x2+2z)4. Express your answer in simplest form.Answer:
Identify Row: Identify the row of Pascal's Triangle that corresponds to the exponent 4. The fourth row (starting with row 0) of Pascal's Triangle is 1,4,6,4,1.
Write Expansion Terms: Write out the terms of the expansion using the coefficients from Pascal's Triangle.The expansion will have terms that correspond to the coefficients 1,4,6,4,1. Each term will be of the form (x2)4−k×(2z)k, where k is the term number starting from 0.
Calculate Each Term: Calculate each term of the expansion.The terms are:1st term: (x2)4−0×(2z)0=x8×1=x82nd term: 4×(x2)4−1×(2z)1=4×x6×2z=8x6z3rd term: 6×(x2)4−2×(2z)2=6×x4×(2z)2=6×x4×4z2=24x4z24th term: 4×(x2)4−3×(2z)3=4×x2×(2z)3=4×x2×8z3=32x2z35th term: (x2)4−4×(2z)4=1×(2z)4=16z4
Combine Terms: Combine all the terms to write the expanded form of the polynomial.The expanded form is:x8+8x6z+24x4z2+32x2z3+16z4
More problems from Pascal's triangle and the Binomial Theorem