Q. Use Pascal's Triangle to expand (3y+5z)4. Express your answer in simplest form.Answer:
Identify Pascal's Triangle: Identify the 4th row of Pascal's Triangle to determine the coefficients for the expansion of (3y+5z)4. The 4th row of Pascal's Triangle is 1,4,6,4,1.
Write Expansion Terms: Write out the terms of the expansion using the binomial theorem and the coefficients from Pascal's Triangle.The expansion will have the form: 1×(3y)4×(5z)0+4×(3y)3×(5z)1+6×(3y)2×(5z)2+4×(3y)1×(5z)3+1×(3y)0×(5z)4.
Calculate Each Term: Calculate each term of the expansion.1st term: 1∗(3y)4∗(5z)0=1∗81y4∗1=81y42nd term: 4∗(3y)3∗(5z)1=4∗27y3∗5z=540y3z3rd term: 6∗(3y)2∗(5z)2=6∗9y2∗25z2=1350y2z24th term: 4∗(3y)1∗(5z)3=4∗3y∗125z3=1500yz35th term: 1∗(3y)0∗(5z)4=1∗1∗625z4=625z4
Combine Terms for Expansion: Combine all the terms to write the final expanded form of 3y+5z^{4}. The expanded form is: \({\(81\)y^\(4\) + \(540\)y^\(3\)z + \(1350\)y^\(2\)z^\(2\) + \(1500\)yz^\(3\) + \(625\)z^\(4\)\}).
More problems from Pascal's triangle and the Binomial Theorem